[Opendnssec-develop] On OpenDNSSEC Adapters

[Matthijs Mekking]

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Hi,

As said in the meeting, I am working on the adapters in a separate
branch. In parallel, I am trying to see if I can reduce the memory usage.

In a nutshell:

In the current signer (1.{2,3}.x), The zone data is stored as a tree of
domains. On each domain, I maintain a collection of RRset structures.
Each RRset structure has a list of RRs that exist in the current version
of the zone, a list of RRs that have to be added and a list of RRs that
have to be removed.

To be able to introduce incremental adapters, I want to introduce a
journal entry at the top level of the zone data. When changing signer
configuration or reading a new version of the unsigned zone, I keep
track of all records that need to be added and removed this specific
update (including DNSKEYs, NSEC3PARAM, NSEC(3)s and RRSIGs). When having
a zone with an IXFR output adapter, the journal entry is written
(instead of the whole zone).

The main advantages are:
- - The adapter so to say is now presented with a journal entry and can
decide on purging and condensing strategies, without the signer kernel
having to worry about that.

- - No more need to maintain a list of RRs to be added and to be removed
at RRset structure (will save a lot of pointers and RR clones).


Best regards,

Matthijs
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